The composition book is super useful, because starting on page 87 is an English-Latin vocabulary containing I'd say 99% of the words used in the exercises, which makes choice of words easy. There are also hints in the exercises about what words should be used for certain phrases.

Since I can find no answer key, can I get anyone to look over my answers? Here is the first exercise.

5. Bocchus was gained over to the Roman cause by Sulla, the quaestor of Marius.Bocchus a Sulla quaestore Marii ad causam Romanam conciliatus est.

6. The consul Publius Rupilius brought the Servile War to an end by the capture of Tauromenium and Enna, the two strongholds of the insurgents.P. Rupilius consul expugnatione Tauromenii et Ennae duorum praesidiorum seditionum Bellum Servilem confecit.